tridymite

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Related to Trydimite: cristobalite

tridymite

(ˈtrɪdɪˌmaɪt)
n
(Minerals) a form of silica found in igneous rock
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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Noun1.tridymite - a mineral form of silicatridymite - a mineral form of silica    
mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition
silica, silicon dioxide, silicon oxide - a white or colorless vitreous insoluble solid (SiO2); various forms occur widely in the earth's crust as quartz or cristobalite or tridymite or lechatelierite
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References in periodicals archive ?
Major mineral constituent of the lime is calcium hydroxides (Ca(OH)2) while the RHA contains Trydimite mineral.
This clay has a smectite content greater than 90% (93 [+ or -] 2%), with quartz (2 [+ or -] 1%), plagioclase (3 [+ or -] 1%), cristobalite (2 [+ or -] 1%), potassic feldspar, calcite, and trydimite as accessory minerals.
There are multiple toxic forms of crystalline silica, including quartz, trydimite and cristobalite.